Machine tool



Sept. 2, 1930. TRQSCH 1,775,006

MACHINE TOOL Filed Aug. 10} 1927 7 Sheets-Sheet 1 %L'SATTORNEY Sept. 2 1930, v A. TRO'SCH 1,775,006

' MACHINE TOOL Filed Aug. 10, 1927 7 Sheets-Sheet 2 R- j Z d /4 oATTORNEY .1 Sept. 2, 1 930. osc 1,775,006

' Qmcnmn TOOL Filed Aug. 10, 1927 7 Sheets-Sheet 3 'lg f ffiwsm %dsATToRNEY Sept. 2, 1930. A. TROSCH MACHINE TOOL Filed Aug. 10, 1927 7 Shoots-Sheet 4 INV TOR Q flzfre rosc/L /r= %25ATT0RNEY Sept. 2, 1939.

A. TROSCH MACHINE IOOL I Filed Aug. 10, 1927 2;; ATTORNEY v7 Sheets-Shet 5 l NTOR Fosck Sept. 2, 1930. A. T R SCH 1,175,006

MACHINE TOOL Filed Aug. 10, 1927 7 Sheets-Sheet 6 A. TROSCH MACHINE TOOL Sept. 2, 1930.

Filed Aug. 10, 1927 7 sheets-sheet 7 INVENTQB LBJ Wm @ATTQRNEY M i above described, butalso .withthe usual rack and pinion drive, the latter to be used during falloperations other than thread cutting. If

only a screw. drive were provided for all operations, the Wear upon such a drive would 7 be considerable. and eventually the screw and nut. would be worn to such an extent that the carrier would no longer travel smoothly and; out truethreads. Therefore, adupleX drive should be provided so that the rack and'pin-' 1OIl.W1ll receive the wear incident to ordinary operations where the, accuracy of a screw drive is not needed, and the screwdrivewil be used only in thread cutting or similar accurate operations,.thus greatly prolonging its usefullife. I

If the machine be provided witha duplex drive, some interlocking mechanism must be used to prevent accidental use of both drives atthe same time, whichmight seriously injure the machine. This invention therefore contemplates .theprovision of a suitable interlocking mechanism so arranged that the 'rackfand pinion drive can be rendered ef fective only when the screw. driv .is ineffective, and vice versa.

Only a part of a boring machineis shown inthe drawings it being understood that the invention is appliedto a convent onal boring machine having a rotatable-table and suitable sourcefofpowcrfor turning the table and. driving the tool 'carrier. Above the table (not shown) is mounted the conventional cross-rail .21 having guide ways in which the :toolhead 22.n'iay be adjusted in the conventional manner. Upon this head is fixed the tooljcarrier housing, comprising a lower portion23 and an upper portion 124. The tool carrier '25, raving a rack 26 guidiir surfaces areprov along one side thereofyas shown in Figure (his mounted for longitudinal movement within. the housings and 2-4. Suitable ed on the carrier,

e Withgihs within as at 2", and these coope the housing23 so that. the carrier held againsttransversev movement and guided ac- .eurately for .longitudin al movement. 7 lower endof the can .f tional toolholder 28 The v I .achedthereto so am any suitable tool, such as 29 .1nay beuse The-ramentioned, maylliie driven in a number of ways]. One possible form of driving mechanism comprises the shafty30v'hich is driven in th'ecwell-known manner from the source of power, this shaft beingso timed/with relationto the table of,

thebo'ring mill that it will make a predetermined number of revolutions "during each revolution'ofthetable. As is usual in such 7 machines, a gear box may be employedso that mayhave aconven screw.

the driving ratio between this shaft and the table may be varied at will.

On this driven shaft 30 is loosely keyed a spiral gear 31 arranged so that it may be moved longitudinally along the shaft when the tool head is adjusted to various positions along the rail 21. This spiral gear 31 drives a second spiral gear 32 fixed to a shaft 33 (Figure 2)., on the other end of'which is a bevel gear 34. This bevel gear drives another bevel gear35 fixed to a shaft 36. This driven shaft 36.1nay be provided with a worm 37, shown in Figure 2, which meshes with a worm wheel 38 illustrated in Figures 3 and 4. This worm wheel 38 is preferably formed integral with a driven member in the form of a sleeve 39 rotatably mounted'on a shaft 40. The worm wheel. is held between a shoulder 41 on this shaft and a part 42 of the frame so as to prevent longitudinal movement of the sleeve relative to the shaft. The shaft has a pinion 43 at one end thereof the teethof this pinion preferably being cut directly on the shaft. This pinion. 43 meshes with an idler pinion 44 which in turn engages the rack 26 abovedescribed.

In order to drive the shaft 40 from. the driven sleeve 39, any suitable clutch mechanism might be employed. Preferably, a member 45 is keyed to one end of. the sleeve, this member being one part of a clutch as clearly shown in Figures 3 and 4 A second clutch member 46, arranged to cooperate with themember 45, is loosely keyed on the shaft 40 so as to be capable of longitudinal movement relative to the shaft while at the same time having a rigid rotative connection therewith; It is apparent from Figure 3 that when the clutch member 46 is moved into cooperative relation with the member 45, the driven member 39 will be operatively connected to the shaft 40, and the motion of this driven member will be transmitted through the parts 45 and 46 to the shaft 40, thus rotating the pinions 43 and 44 and moving the tool carrier. In order to hold the clutch in closed position, various devices could be provided. One form of mechanism for accomplishing this comprises a screw 47 fixed to the end of the shaft 40 and a h and wheel 48 threaded on this screw and acting as a nut thereon. This hand wheel may he turned so as to force the clutch member 46 along the shaft 40 into engagement with the cooperating clutch inember 45. A stop member 49 at the end of the screw 47 prevents the handwheel 48 from being unscrewed so far as to fall off of the hen it is desired to open the clutch 45, 46 to'render the rack and pinion drive ineffective, the hand wheel 48 may beturned so as to move outwardly along the screw 47 and the clutch member 46 may then be slid a short distance along the shaft 40 until it is out of Contact with member 45.

-115 I num e :60 I In orderito oscillate the:camisogastemeve 'the split nut;from'efl ectiveto' ineflective pee sitie;n,-a bevel gear 58 maybefixedto the cam -.;The special sc revv drive fer the tent [carrlerzmay be constructed n a nnmhefr of Ways; 1

y In the. embodiment; illustrated in the draw,

, ings, the carrieris made hollow, ins shown in H I tatably :,monntedz insuitable E mewis,;r0-: earin'gs at the top ofthe housing 24- andextendszthence down,- Ward through the, opening in the; carrier- 25.?

Figures 5, Gancl 11, and a, 1011 e The driven shaft 36: above. mentioned is ex 11m tended upward shown: in I igures', 1 and 5, and carr esajspnr gear mounted thereon. This gear meshfisfwithia-jsimilar gear 52-fixed tothe screw 50, E'sOji that-the serewlis i'c'ontinn ously rotated as long Zasthe. driven1shaft36 :Qf. Q- mjechanisms" might; he en1-.-.

. played to establish aidrivinglrelationbetween-- x1119 rotatable screWL,.50;and:the todl n-ins.

hqusing '53 -attach'ed to; thetopf-the carrier nd having; suitable transverse,gaideways formed therein; Slidably meuntedin theseguidewaysare members 54 and '55,",t6gether1 members 54, 55 t0 the ,hensing 53ja'nd, thence tothe tool carrier, thus resulting in l'ongitiidinal movement fthe'latter; f 'When it is desired to rendenth'e'screwdrive:

I lnQfliQCtiVQ th members :54, 55: constituting the nut may .be separated so as ftelbeput off" contactcwilththe threads {of the serewythis' positionbeing shown ,inEigure '10.;When the parts are in thisrelationship, theserew 50-maycontini1e to rotate Withontfhavin'g i any efiejct uponthe the carrier;

"split nut 54, 55 VOIIIIPVOHI One possible fermhf mechanism for 'ni-ov lngthe split nut 154,55 from one positionto the other, comprises the camz56:,sh0wn1'in' Figures 11,12 and-18; =This-camhas'fasuit able bearing in the housing 53'and is provid- 1 *5!) ed on one face Wit-h the'spiralg-cani grooves' 57. 1 Pins 58 set rigidly into; the Vparts54,'55 of the split nut project from-theiface ofthe V nut,'as shown in" Figure 14,'andieXtend into the-cam grooves 51. Rotationef the cam in onedirection Will .thereforetend to draw the vpins 58 together, :tl'lLlS closingthe :nnt; this positionbeing illustrated .inFigure 12. Ii R0- will spread :the pins apart and open I the nut,

tat-ion Qf the camv in t ller opposite direction as shown in Figure-13.-

and may; mesh 3 with another she velfigear 59 lopsely keyed upon a shafitvGO 'WhiCh'eXtendS 61 (see Figures 5 themadhine;

narallel to the carrier QSfltithin-the housing":

214. i' This shaft 60 isillus'trated in Figures 'jfthe'heusing 53 solas torbe held'against longi{ tudin al movement therein but 'to :be free for rotation-1t: willbe'i'iinderstood that as'the moves; correspondingly along the shaft 60,

alivaysjmaintaining a rigid retativeconnectionwith that shaft-hyevirtne of being loose? 1y k y'da'thereonk Consequently, joscillatien of? the 1- shaft 60 will" turn the bevel g' ar w may be sit-uated,iand thus the split fnntfmay be engagedlor disengaged with the. screw '50 easily. andgqiiickly; at any time, simply'b'y I tlllllingiitlie shaft 60. Inorder to' tnrnthis" -shaft,iti may 1 be provided 1 With crankarm 7', 8 V and; 11)-- fixedto' 'itznear its-lower'endty fln U17 5 1;

1 From the, mechanism so far described, it will be apparent that the; rack and-pinion tive or ineffective at any tiniesimply by'turn ingthe hand-Wheel 48 tdtighten orfloesen the ClLltChl"lc5, j4t6," fl lld tlIG SCI'GWLZClI'lVG maylike Wiseberende'red effective or ineflective-si'mg 1 ply by mevingthe levfen-61 toturn the shaft 6,0 In'erdertolprevent'tlie possibilit'y'of 4. the operator throwing betlrofthe drivest9 M f eflectiveipesition at thesame' =time, therel'is vemployed 1 interlbckingr mechanism which carrier. 25" i'nOvles up Or down during the o p-f 'erat 'on 0f the mach1ne,the bevel-gear 59 v -n0-,matter in What position. the carrier 25 7 drive for the carrier maybe rendered efiec, i I 3 ill-now gbefldescribedi-f This mechanismin ii one form comprises a lever 62,isho wn in Fig? imf placed ,in' convenientposition:to' be reached 1 by ,the shand i0fftl'lef operator and is mounted Y Q 1 l'nsi one point so as to fqrmaIplatelike'member upon a bracket .64; The 'lever' is widened at.

65 havinga holetfi therein; V Thereis acor' e respondinghole 67 in the=bracket64, so pesif I tionedth'at it is in alinement With the hole 66 when thGJIBVGPfGQ is thrown to the posi -ltion ferwldisengaging the split nnt'frelnthe screw, thiscrelationship beingshown inflflig V j i ti s 3 and? ""Whenthe lever 62-is nivedto'citsetheripositiom' however, 50 as to en ga e :the split nut with the I screw, the hole I 66ri's-"then n6 longer in alinement With-the r 8 hole 67fbutian unperforated :portion of the 'plate'65 overlies the hole in-the bracket. The h when in. this positionare illustratedflin parts Eigures 4 anaev I r thej'clutch member.

4' 6,- aheve descrihecl, Y e

is an :Vannn lar' fiange 0r 68 arrangedhs 4 ,sh'ownfinF-igures "3 and' 4', and 'havin'gfa; lip [68?at'the edge thereof. A nwnqmsmnm abeve' this rim is a1brack'et69 having; a hole '7Q' therein ,this'h'ole'beingin alinementwith I I thejholei67. A'rod 751' fpasse'sith'rough the 1 heles 67 and 70 and has a cellar 7 2 thereon to pr vm" he rod from jheing removed; from Itis apparent 'froin an inspection ofFiguresB and 4 that when the clutch 45, 46 is in its closed position ('Figure. 3-), the annular rim 68 is in alineme'nt withthe rod 71, and therefore therod must be, elevated so that it islout of the way of the lip 68 before the clutch member 46 v canbe movedfrom alignment with the rodeo that the rod ca'n be' moved to the Figfi4 position to re'lease'the lever 62 and move into the path of the. clutch member 46 ahd-engage theclutch member 45.

- This rod cannot be elevated, however,- unless I I which .jalinement takes place only when the the hole 66' is in "alinement Withthehole' 67,

split nut is inits ineffectiveposition The handle 62 must therefore be; placed soi as to render the screw driveineffective before the clutch member .46 can be moved to the Fignre lposition to make'the rack'and pinion drive operative. Similarly,before the screw drive can be made effective, the clutchmust first-be disengaged and themember 46 "must be pulled outward away from themember sufiiciently far so that therod 71*maydrop downward past the edgeof the rim '68, as

. shown in Figure 4. Whenthis has been done, the upper end of the rod? '1 no longer extends through the 'hole 66, and the-lever 62 is then free to be moved to, its other; position. Thus asimple and effective interlocking mecha nism has been'provided of fewparts, and not liable'to get out of order, whicheflectua'lly prevents the operator :of the "machine, from making both drives effective simultaneously, either accidentally or on purpose.

1 In order to permit easy operation of the i parts of the machine, the spindle 25 and other vertically movin g parts mayJ be counterwe1ghted 1n the conventionalmanner.

In this instance, an annular counter-weight 75,

"sl1own,in,'Figure l, surrounds the housing 24 and'is connected to acable76 passing over a sheave 77 ,theotherend of thebablebeing connected to-a hook 7 8 attached to the top of the-housing 53. The counter-weight '7 5 may have a groove i'i) atone point thereof so as to provide c1earance for the'shaft 36;

The. operation- 0f the machine is fol'-:

lows 'The gear box or other gearing connections (notshown) areadjusted to give the desired driving ratio between the revolutions of-the work table and th'os'e of'the shaft 31.

' The rotation 'ofthis shaftis' transmitted to the driven sleeve 39, through the various con-- nections described above. For allordlnar'y work, not requiring the extreme ,a'ccuracyiof 'thescrew drive, the handle 62 is fkeptmiii the position shown in Figure '7, so thatithis drive is lllefiQtlVB.

Assumingv nowj'that the tool carrier; is at the top of its stroke, and that thefoperator desires to move it downward to'makea out, he closes the clutch 45, 46 by turning thehand wheel 48. Themotion of the'driven sleeve 39 is now transmitted through the clutch'to the rod 71 canbe elevated.

tion, the lip 68 abuts against the rod 71 and V prevents the member 46 from being accidenrod drops tallypulled out so far that the down beside. the rim 68.

"Nhen the tool carrier has reached the end of its downward travel, it may be returned to initial position byhand, by disengaging the cli tch in the-manner just described and then rotating the member 46 by means of the spokes fixedlto the periphery thereof. This will turn the shaft'4O and drivethepinions 43 'and44 so as to elevate the tool carrier.

The weight of the tool carrier is balanced by the counterweight 7 5, and therefore verylittle foreeiis requiredto move it. Instead of returning the carrier by hand, however, the

clutch may be leftin engaged position if desired, and the usual quick-return (not shown) [may be operated, thus returning the tool car rier by power; l 7

If the operator desires to cut a'screw thread or to perform any other operation requiring great accuracy, he unscrews the hand wheel 48 to the limit of its motion, and pulls the clutch member 46all the way out, at the same time lifting the rod7'1 slightly so that'it will not catch on the lip 68 The rim 68-is then in the position shown in Figure 4, and the rod 71 may be lowered past the edge ofjthis rim,

to the position indicated in that figure. This lowering of therod unlocks the handle or lever- 62, which may now be shifted'from the Figure 7 position to that shown in Figure 8, thus engaging the split nut 54, with the screw 50. .The tool carrier is then driven from the special-screw drive, in the manner which has been'explained indetail above. lVhen the carrier has reached the bottom, of

its stroke, the handle 62 is moved back to the Figure 7 position, disengaging the drive. The member46 may then be rotated by'hand in the mannerdescribed above, to return the parts to their initial position for the next operation.

If it isdesired to operate the rackand pinion feed again, after using" the screw drive, the rod-71 elevated and held up by hand while the clutch member 46' is'shoved in far enough so that the rim 68 will support the rod. 1 The clutch may then' be opened or closed as often as desired, in themanner describedabove, without interference from the rod. Of course, thehandle 62 must be in its disengaged or'Figure'? position before the lit) ' ing member in its ineffective ;positionwhen sald clutch is closed',' and to hold sald clutch; -.1'n its open positlon when .saldoperatmg mem- While one embodiment of the invention hasbeen disclosed, it is to be understood that the inventive idea maybe carried out a number of Ways. This apphcation ls therefore not to be limited to the precise details shown, but is intended to cover all modifica tions thereof falling within the spirit of the invention or the scope ofthe appended claims:

I claim: i

1.. In a machine ,tool, the combination'lof a movable hollow tool vcarrier, arack fixed onsaid carrier, a pinion meshing with saidrack, means includinga clutch for driving said pinion, a rotatable. screw arranged I within I said carrier, mechanism mounted upon'said earner and movable. from an lneffectlve' posl tion to a position in whichit is effective to drive said carrierfrom the' threads of said screw,'an operat ng member at a fixed point on the machinefor'moving said mechanism,

and a rod so arranged as tohold said operatber is in its eiiective position."

2. In a machine tool,theicombmati'on of a movable tool carrier, a rackconnectedlto said carrier, a pinion meshing with said rack,

means fordriving said'pinion including an axially movable clutch member, an'annular flange fixed to said clutch member, a rotatable screw parallel to said carrier, mechanism'mounted upon said carrierand' movable 'I from an ineffective position to a position in which it is effective to establish adriving con.-. nection between saidcarrier-and the threads of said screw, means for movingsaid mecha' anism from effective to inelfective position including a movable plate having'jan-v ope'n ing therein, and a longitudinally-movable'rod so positioned as tobe in alinementwithsaid 7 opening when said. 'plate is in; a position to i longitudinally {movable tool carrier,'.arack 1 carried .by thetool carrier, a'pinion eng'ag ing said rack, clutch-controlled [operatingmeans for the-:pi-nioma rotating screw,'splitf nut mechanism on th'e carrier for engagement i with the screw, operating meansfor con trolling thesplitnut mechanismincludingia ating' member and the'clutch-controlled' pin rendersaid mechanism'inefiectiv e, said rod also being in alinement withjsaid annular flange when said clutch is inits closed: posi-T' tion, said plate,frod," and flange' beingso ar' .ranged that said rod mustbeinsertdiiisaid; opening before said clutch maybe closed and {must be moved into the path ofrsaid -flange before said 'platemay be moved. Y i

3. In a machinetooh the 'combinationof' a vertically j disposed "oscillatory actuating shaft, gearing on thctoolfcarfier slidable' on. V said shaft verticallyandoperativelyconnect ing thesamewithlthelsplitnutmeChflnismy an operating. member on saidiverticalshaft,

and interlocking means between said opera ion, simultaneously.

lagiven locking positio'm means to renderit inoperable.

ion driving means whereby to prevent "operation of. the tool carrier by the screw and pin- 4. In a machine tool, the combinationof-a movable tool carrier, rack and pinion means for, moving said carrierat a rapid rate, means;

operable to render saidrack and pinion means effective or ineffective, screw means for m oving said carrier at a relatively slowrate of speed. for cutting threads, means operabletoj render said screw means'effective or ineffec V tics, and a-locking device for selectivelock- I ing engagementwith one-or the otherof said operablefmeans when the latter are in in- I. 1 1 operatlveposltlon for rendermg such means inoperable until the locking. dev ce is manur.

ally moved toitsotherjp'ositio'n,one of said operable means being operable repeatedly and the other of said operable means being posi tively lockedwhileithelocking device is inv movable tool carrier, rack and pinion means i for moving sald carrier. at'arapld rate, means operableto render said rack andpinion means effective ineffective, screw means formovingsald carrier at a relat vely slow ra'teof speedv for cutting threads,- 1neans operable' I I to render sa1d screw means effective or 1'n'- effective, and an interlocking deviceffor'se lectlve locklng engag'ement w th one] or? the other of said operable means fori-endering L it inoperable-while the other' is repeatedly operable until, the. interlocking device is.

. moved manually 'outjof engagement with the noperable mGQHSftOJBHdQY 1t 'operable. and

flnto locking engagement; with the operable:

, 6. In a-macliine tool, the combination ing two relativelymovable members for operatively connecting. and disconnecting; said driving means andj pinion,;,screw. means for of a 'movable tool carrier, rack and pinion means f formov ngsa dcarr erata rapid. rate, drivingmeans for ;sa1d pmlon, a clutch comprisl,

5, In a machinetool, thejcombin'ation ofa for cutting threads, 'alever for "operatively render the clutch iinoperable and the lever operable. locking device being movable 'f. ananua'lly into{ engagement with said lever when thelever. is inposition to disconnect the;

screw means from the carrierto render the "connecting or disconnectingsaid'screw means :with thecarri'er, and a locking device p'o si- U y tionable on-the fixed member of. the clutchand"- .in the path ofthe'movable clutch member to] 0" .lmovingsaid'carrier independently of the rack! and-pinion at a-relativ'ely slow rate of. speed 

